Coniugazione del verbo inglese COULD HAPPEN
Verbo regolare: happen - happened - happened
Affermazione
Forma semplice
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it
could happen
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Forma con V-ing
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it
could be happen
ing-
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Perfetto
-
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it
could have happen
ed-
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Perfetto con V-ing
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it
could have been happen
ing-
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Negazione
Forma semplice
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it
could not happen
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Forma con V-ing
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-
it
could not be happen
ing-
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Perfetto
-
-
it
could not have happen
ed-
-
-
Perfetto con V-ing
-
-
it
could not have been happen
ing-
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Forma interrogativa
Forma semplice
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could it happen?
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Forma con V-ing
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could it be happen
ing?
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Perfetto
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-
could it have happen
ed?
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-
-
Perfetto con V-ing
-
-
could it have been happen
ing?
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Forma interro-negativa
Forma semplice
-
-
could it not happen?
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Forma con V-ing
-
-
could it not be happen
ing?
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Perfetto
-
-
could it not have happen
ed?
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-
-
Perfetto con V-ing
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could it not have been happen
ing?
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